voldemort.store.memory
Class InMemoryStorageEngine<K,V>

java.lang.Object
  voldemort.store.memory.InMemoryStorageEngine<K,V>

All Implemented Interfaces:

StorageEngine<K,V>, Store<K,V>

public class InMemoryStorageEngine<K,V>
extends java.lang.Object
implements StorageEngine<K,V>

A simple non-persistent, in-memory store. Useful for unit testing.

Constructor Summary

InMemoryStorageEngine(java.lang.String name)

InMemoryStorageEngine(java.lang.String name, java.util.concurrent.ConcurrentMap<K,java.util.List<Versioned<V>>> map)

Method Summary

void	close() Close the store.
boolean	delete(K key)
boolean	delete(K key, Version version) Delete all entries prior to the given version
void	deleteAll()
ClosableIterator<Pair<K,Versioned<V>>>	entries() Get an iterator over pairs of entries in the store.
java.util.List<Versioned<V>>	get(K key) Get the value associated with the given key
java.util.Map<K,java.util.List<Versioned<V>>>	getAll(java.lang.Iterable<K> keys) Get the values associated with the given keys and returns them in a Map of keys to a list of versioned values.
java.lang.Object	getCapability(StoreCapabilityType capability) Get some capability of the store.
java.lang.String	getName()
java.util.List<Version>	getVersions(K key)
ClosableIterator<K>	keys() Get an iterator over keys in the store.
void	put(K key, Versioned<V> value) Associate the value with the key and version in this store
java.lang.String	toString()
java.lang.String	toString(int size)
void	truncate() Truncate all entries in the store

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

InMemoryStorageEngine

public InMemoryStorageEngine(java.lang.String name)

InMemoryStorageEngine

public InMemoryStorageEngine(java.lang.String name,
                             java.util.concurrent.ConcurrentMap<K,java.util.List<Versioned<V>>> map)

Method Detail

close

public void close()

Description copied from interface: Store

Close the store.

Specified by:

close in interface Store<K,V>

deleteAll

public void deleteAll()

delete

public boolean delete(K key)

delete

public boolean delete(K key,
                      Version version)

Description copied from interface: Store

Delete all entries prior to the given version

Specified by:

delete in interface Store<K,V>

Parameters:

key - The key to delete

version - The current value of the key

Returns:

True if anything was deleted

getVersions

public java.util.List<Version> getVersions(K key)

Specified by:

getVersions in interface Store<K,V>

get

public java.util.List<Versioned<V>> get(K key)
                                 throws VoldemortException

Description copied from interface: Store

Get the value associated with the given key

Specified by:

get in interface Store<K,V>

Parameters:

key - The key to check for

Returns:

The value associated with the key or an empty list if no values are found.

Throws:

VoldemortException

getAll

public java.util.Map<K,java.util.List<Versioned<V>>> getAll(java.lang.Iterable<K> keys)
                                                     throws VoldemortException

Description copied from interface: Store

Get the values associated with the given keys and returns them in a Map of keys to a list of versioned values. Note that the returned map will only contain entries for the keys which have a value associated with them.

Specified by:

getAll in interface Store<K,V>

Parameters:

keys - The keys to check for.

Returns:

A Map of keys to a list of versioned values.

Throws:

VoldemortException

put

public void put(K key,
                Versioned<V> value)
         throws VoldemortException

Description copied from interface: Store

Associate the value with the key and version in this store

Specified by:

put in interface Store<K,V>

Parameters:

key - The key to use

value - The value to store and its version.

Throws:

VoldemortException

getCapability

public java.lang.Object getCapability(StoreCapabilityType capability)

Description copied from interface: Store

Get some capability of the store. Examples would be the serializer used, or the routing strategy. This provides a mechanism to verify that the store hierarchy has some set of capabilities without knowing the precise layering.

Specified by:

getCapability in interface Store<K,V>

Parameters:

capability - The capability type to retrieve

Returns:

The given capaiblity

entries

public ClosableIterator<Pair<K,Versioned<V>>> entries()

Description copied from interface: StorageEngine

Get an iterator over pairs of entries in the store. The key is the first element in the pair and the versioned value is the second element. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

entries in interface StorageEngine<K,V>

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<K> keys()

Description copied from interface: StorageEngine

Get an iterator over keys in the store. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

keys in interface StorageEngine<K,V>

Returns:

An iterator over the keys in this StorageEngine.

truncate

public void truncate()

Description copied from interface: StorageEngine

Truncate all entries in the store

Specified by:

truncate in interface StorageEngine<K,V>

getName

public java.lang.String getName()

Specified by:

getName in interface Store<K,V>

Returns:

The name of the store.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toString

public java.lang.String toString(int size)